public static uint Update(uint maxInstr, int *pReturnCode)
{
tThread *pThread;
tThread *pPrevThread;
uint status;
pThread = pAllThreads;
// Set the initial thread to the RUNNING state.
pThread->state = THREADSTATE_RUNNING;
// Set the initial CurrentThread
pCurrentThread = pThread;
for (;;)
{
uint minSleepTime = 0xffffffff;
int threadExitValue;
status = JIT_Execute.Execute(pThread, maxInstr);
switch (status)
{
case Thread.THREAD_STATUS_EXIT:
threadExitValue = pThread->threadExitValue;
Sys.log_f(1, "Thread ID#%d exited. Return value: %d\n", (int)pThread->threadID, (int)threadExitValue);
// Remove the current thread from the running threads list.
// Note that this list may have changed since before the call to JitOps.JIT_Execute().
{
if (pAllThreads == pThread)
{
pAllThreads = pAllThreads->pNextThread;
}
else
{
tThread *pThread1 = pAllThreads;
while (pThread1->pNextThread != pThread)
{
pThread1 = pThread1->pNextThread;
}
pThread1->pNextThread = pThread1->pNextThread->pNextThread;
}
}
// Delete the current thread
Thread.Delete(pThread);
// If there are no more threads left running, then exit application (by returning)
// Threads that are unstarted or background do not stop the exit
// [Steve edit] Threads that are suspended also do not stop the exit. This is because you'd just
// wait forever for them if they did. Note that 'exit' doesn't mean tearing down the process
// like in a regular .NET runtime case. The application state is still there and we can make
// further calls into it to create new threads.
{
tThread *pThread2 = pAllThreads;
uint canExit = 1;
while (pThread2 != null)
{
if (
((pThread2->state & THREADSTATE_BACKGROUND) == 0) &&
((pThread2->state & (~THREADSTATE_BACKGROUND)) != THREADSTATE_UNSTARTED) &&
((pThread2->state & (~THREADSTATE_BACKGROUND)) != THREADSTATE_SUSPENDED))
{
canExit = 0;
break;
}
pThread2 = pThread2->pNextThread;
}
if (canExit != 0)
{
if (pReturnCode != null)
{
*pReturnCode = threadExitValue;
}
return(THREADSTATE_STOPPED);
}
}
pThread = pAllThreads; // This is not really correct, but it'll work for the time being
break;
case THREAD_STATUS_RUNNING:
case THREAD_STATUS_LOCK_EXIT:
// Nothing to do
break;
case THREAD_STATUS_ASYNC:
pThread->pAsync->startTime = Sys.msTime();
break;
}
// Move on to the next thread.
// Find the next thread that isn't sleeping or blocked on IO
pPrevThread = pThread;
for (;;)
{
pThread = pThread->pNextThread;
if (pThread == null)
{
// That was the thread -- return!
return(THREADSTATE_RUNNING);
}
// Set the CurrentThread correctly
pCurrentThread = pThread;
if ((pThread->state & (~THREADSTATE_BACKGROUND)) != 0)
{
// Thread is not running
continue;
}
if (pThread->pAsync != null)
{
// Discover if whatever is being waited for is finished
tAsyncCall *pAsync = pThread->pAsync;
if (pAsync->sleepTime >= 0)
{
// This is a sleep
ulong nowTime = Sys.msTime();
int msSleepRemaining = pAsync->sleepTime - (int)(nowTime - pAsync->startTime);
if (msSleepRemaining <= 0)
{
// Sleep is finished
break;
}
// Sleep is not finished, so continue to next thread
if ((uint)msSleepRemaining < minSleepTime)
{
minSleepTime = (uint)msSleepRemaining;
}
}
else
{
// This is blocking IO, or a lock
tMethodState *pMethodState = pThread->pCurrentMethodState;
byte * pThis;
uint thisOfs;
uint unblocked;
if (MetaData.METHOD_ISSTATIC(pMethodState->pMethod))
{
pThis = null;
thisOfs = 0;
}
else
{
pThis = *(byte **)pMethodState->pParamsLocals;
thisOfs = 4;
}
unblocked = ((fnInternalCallCheck)H.ToObj(pAsync->checkFn))(null, pThis, pMethodState->pParamsLocals + thisOfs, pMethodState->pEvalStack, pAsync);
if (unblocked != 0)
{
// The IO has unblocked, and the return value is ready.
// So delete the async object.
// TODO: The async->state object needs to be deleted somehow (maybe)
Mem.free(pAsync);
// And remove it from the thread
pThread->pAsync = null;
break;
}
minSleepTime = 5;
}
}
else
{
// Thread is ready to run
break;
}
if (pThread == pPrevThread)
{
// When it gets here, it means that all threads are currently blocked.
//printf("All blocked; sleep(%d)\n", minSleepTime);
Sys.SleepMS(minSleepTime);
}
}
}
}